/Engine/Source/Runtime/Engine/Classes/Materials/MaterialInstance.h
void SetScalarParameterValueInternal ( const [FMaterialParameterInfo](API\Runtime\Engine\FMaterialParameterInfo) & ParameterInfo, float Value, bool bUseAtlas, [FScalarParameterAtlasInstanceData](API\Runtime\Engine\Materials\FScalarParameterAtlasInstanceDat-) AtlasData )